In Figs 16 and 17 the experimental results of Ct , Cr and Cd for the double fixed FB are presented. The influence of S/L
(S = the spacing between the two FBs) on the performance of the double FB is shown. The transmission coefficient decreases
with an increase of S/L from 0.2 to 1.4, where a resonance point is observed after which the transmission coefficient increases for both wave heights. The resonance of the water masses between the two breakwaters seems to be an important parameter in the efficiency of the specific configuration and a wider range, in terms of wave period, of experimental tests would reveal more resonance points.
In Fig. 17 the comparison of the single and double FB indicates that the latter configuration is generally much more efficient. The double FB configuration presents the lowest transmission coefficient, Ct = 0.12, for B/L equal to approximately 0.3. Reflection and dissipation are generally higher for the double FB
case. The energy dissipation in this specific configuration can be attributed to three mechanisms according to the region that the dissipation occurs: (a) in the region of the first FB, (b) in the region between the two FBs and (c) in the region of the second FB.Video analysis reveals that in regions (a) and (c) energy dissipation is mainly due to the existence of vortices formed in the front submerged part of the structures, while in region (b) it is due to wave breaking resulting from the interaction of various waves propagating in opposite directions. However, from a practical viewpoint, the basic disadvantage of the double FB configuration is its increased cost.
In Figs 16 and 17 the experimental results of Ct , Cr and Cd for the double fixed FB are presented. The influence of S/L(S = the spacing between the two FBs) on the performance of the double FB is shown. The transmission coefficient decreaseswith an increase of S/L from 0.2 to 1.4, where a resonance point is observed after which the transmission coefficient increases for both wave heights. The resonance of the water masses between the two breakwaters seems to be an important parameter in the efficiency of the specific configuration and a wider range, in terms of wave period, of experimental tests would reveal more resonance points.In Fig. 17 the comparison of the single and double FB indicates that the latter configuration is generally much more efficient. The double FB configuration presents the lowest transmission coefficient, Ct = 0.12, for B/L equal to approximately 0.3. Reflection and dissipation are generally higher for the double FBcase. The energy dissipation in this specific configuration can be attributed to three mechanisms according to the region that the dissipation occurs: (a) in the region of the first FB, (b) in the region between the two FBs and (c) in the region of the second FB.Video analysis reveals that in regions (a) and (c) energy dissipation is mainly due to the existence of vortices formed in the front submerged part of the structures, while in region (b) it is due to wave breaking resulting from the interaction of various waves propagating in opposite directions. However, from a practical viewpoint, the basic disadvantage of the double FB configuration is its increased cost.
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